We had a few Siemens ELV sites where the top cap assemblies were suffering from excessive condensation. I assume in the past the equipment must have generated enough heat to prevent this but ELV equipment doesn’t.
We fit heaters to all of our cabinets but that’s largely a historical thing to keep Tele12 OTUs happy in the winter.
The sites sit on NAL cabinet bases, so may not be as good as a properly laid seal but wouldn’t have thought this would be too much of an issue? Some of our ELV controllers now have small heaters in them, which pretty much defeats one of the main purposes of ELV!
Are they base sealed & are all ducts etc sealed as well? Not seen major problems at all with ELV except one site that had been left with wet sand in the base. We have an RLCS site where there are problems with condensation in the wide base poles.